On limits of wireless communications when using multiple dual-polarized antennas

In this paper, capabilities of wireless communication systems using multiple dual-polarized antennas at receiver and transmitter side are examined in terms of channel capacity. Therefore an intrinsic channel description including polarization effects is been derived, which allows the modeling of transmission between array antennas which are composed of closely spaced and arbitrarily oriented antennas in a fading environment. Although only two orthogonal polarization can be accessed in antenna farfield, it is shown, that the use of orthogonal oriented antennas may provide high capacities even for closely spaced antennas.